Just hours after Democratic leaders in Congress ratcheted up pressure on Jackson to reveal more information, his office released a brief statement from his doctor.

BySophia Tareen, Associated PressJuly 12, 2012

In this March 20 photo, Rep. Jesse Jackson Jr., D-Ill. speaks in Chicago.

M. Spencer Green/AP/File

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CHICAGO — U.S. Rep. Jesse Jackson Jr.'s disclosure that he is suffering from a "mood disorder" still leaves many questions about his secretive medical leave and whether the the son of the prominent civil rights leader has satisfied mounting calls to be more open about his monthlong absence.

Just hours after Democratic leaders in Congress ratcheted up pressure on Jackson to reveal more information, his office released a brief statement from his doctor on Wednesday saying the Chicago Democrat was receiving "intensive medical treatment at a residential treatment facility for a mood disorder."

But it offered no details about Jackson's whereabouts or even the name of the doctor, citing federal privacy laws.

Several experts said that based on the doctor's use of the term "mood disorder," they believed Jackson might be suffering from depression. But the statement did not elaborate on his condition and rejected claims that the 47-year-old congressman was being treated for "alcohol or substance abuse."

When Jackson's medical leave was first announced — two weeks after it began on June 10 — his office said he was being treated for exhaustion. Last week his staff said his condition was worse than previously thought and required inpatient treatment, saying Jackson had been privately battling emotional problems. The office has remained mum on details.

The timing of the leave has invited scrutiny, coming as Jackson faces an ethics investigation in the U.S. House connected to imprisoned former Illinois Gov. Rod Blagojevich. Days before Jackson's office announced his leave, a fundraiser and family friend also involved in the probe was arrested and charged with unrelated medical fraud charges.